Distinguishing nonstandard scalar and fermionic charged particles at future $e^+e^-$ collider

TL;DR

This paper explores methods to distinguish scalar and fermionic exotic charged particles at future electron-positron colliders using angular distributions and polarization, aiding in identifying new physics models like IDM and MSSM.

Contribution

It introduces a novel approach using angular and polarization observables to differentiate scalar and fermionic charged particles in collider experiments.

Findings

Angular distributions can distinguish between scalar and fermionic particles.

Polarization enhances the identification of the particle nature.

Specific angular variables provide robust signals for model discrimination.

Abstract

We investigate the possibility to identify the nature of spin of exotic charged particles at the future $e^+e^-$ collider in $l^\pm+2j+MET$ final state choosing IDM and MSSM as examples for the new physics models with scalar and fermionic exotic charged particles, respectively. We choose four benchmarks for the mass parameters for a significant deviation from the SM $W^+W^-$ background. We find that the $\cos\theta$ of $W$ boson constructed from $jj$ pair and lepton have the potential to identify the MSSM signal compared to the IDM signal in longitudinally polarized initial beams. A more robust comparison is seen in the shape of the azimuthal angle of the $W$ boson and charged lepton, which can identify the IDM signal further if the beams are transversely polarized.